In a TCP/IP network， which of the following commands utilizes the ICMP protocol？（）

A.DNS is not working properly
B.Ping is not working properly
C.The cables are disconnected
D.The device driver did not load properly

A.DNS
B.NIS
C.DHCP
D.etc/hosts file

A.Class A
B.Class B
C.Class C
D.Class D